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# Copyright 2026 The Sapient AI Authors and the HuggingFace Inc. team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from collections.abc import Callable
from contextlib import nullcontext
from typing import Optional

import torch
from torch import nn

from ... import initialization as init
from ...activations import ACT2FN
from ...cache_utils import Cache, DynamicCache
from ...configuration_utils import PreTrainedConfig
from ...generation import GenerationMixin
from ...integrations import use_kernel_func_from_hub, use_kernelized_func
from ...masking_utils import create_causal_mask, create_masks_for_generate
from ...modeling_layers import GradientCheckpointingLayer
from ...modeling_outputs import BaseModelOutputWithPast, CausalLMOutputWithPast
from ...modeling_rope_utils import ROPE_INIT_FUNCTIONS, dynamic_rope_update
from ...modeling_utils import ALL_ATTENTION_FUNCTIONS, PreTrainedModel
from ...processing_utils import Unpack
from ...utils import auto_docstring, can_return_tuple, logging
from ...utils.generic import (
    TransformersKwargs,
    is_flash_attention_requested,
    maybe_autocast,
    merge_with_config_defaults,
    split_attention_implementation,
)
from ...utils.output_capturing import capture_outputs
from .configuration_hrm_text import HrmTextConfig


logger = logging.get_logger(__name__)


class HrmTextRMSNorm(torch.nn.Module):
    def __init__(self, eps: float = 1e-6):
        super().__init__()
        self.eps = eps

    def _norm(self, x):
        return x * torch.rsqrt(x.pow(2).mean(-1, keepdim=True) + self.eps)

    def forward(self, x):
        return self._norm(x.float()).type_as(x)

    def extra_repr(self):
        return f"eps={self.eps}"


class HrmTextMLP(nn.Module):
    def __init__(self, config):
        super().__init__()
        self.config = config
        self.hidden_size = config.hidden_size
        self.intermediate_size = config.intermediate_size
        self.gate_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=config.mlp_bias)
        self.up_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=config.mlp_bias)
        self.down_proj = nn.Linear(self.intermediate_size, self.hidden_size, bias=config.mlp_bias)
        self.act_fn = ACT2FN[config.hidden_act]

    def forward(self, x):
        down_proj = self.down_proj(self.act_fn(self.gate_proj(x)) * self.up_proj(x))
        return down_proj


def rotate_half(x):
    """Rotates half the hidden dims of the input."""
    x1 = x[..., : x.shape[-1] // 2]
    x2 = x[..., x.shape[-1] // 2 :]
    return torch.cat((-x2, x1), dim=-1)


@use_kernel_func_from_hub("rotary_pos_emb")
def apply_rotary_pos_emb(q, k, cos, sin, unsqueeze_dim=1):
    """Applies Rotary Position Embedding to the query and key tensors.

    Args:
        q (`torch.Tensor`): The query tensor.
        k (`torch.Tensor`): The key tensor.
        cos (`torch.Tensor`): The cosine part of the rotary embedding.
        sin (`torch.Tensor`): The sine part of the rotary embedding.
        unsqueeze_dim (`int`, *optional*, defaults to 1):
            The 'unsqueeze_dim' argument specifies the dimension along which to unsqueeze cos[position_ids] and
            sin[position_ids] so that they can be properly broadcasted to the dimensions of q and k. For example, note
            that cos[position_ids] and sin[position_ids] have the shape [batch_size, seq_len, head_dim]. Then, if q and
            k have the shape [batch_size, heads, seq_len, head_dim], then setting unsqueeze_dim=1 makes
            cos[position_ids] and sin[position_ids] broadcastable to the shapes of q and k. Similarly, if q and k have
            the shape [batch_size, seq_len, heads, head_dim], then set unsqueeze_dim=2.
    Returns:
        `tuple(torch.Tensor)` comprising of the query and key tensors rotated using the Rotary Position Embedding.
    """
    cos = cos.unsqueeze(unsqueeze_dim)
    sin = sin.unsqueeze(unsqueeze_dim)
    q_embed = (q * cos) + (rotate_half(q) * sin)
    k_embed = (k * cos) + (rotate_half(k) * sin)
    return q_embed, k_embed


def repeat_kv(hidden_states: torch.Tensor, n_rep: int) -> torch.Tensor:
    """
    This is the equivalent of torch.repeat_interleave(x, dim=1, repeats=n_rep). The hidden states go from (batch,
    num_key_value_heads, seqlen, head_dim) to (batch, num_attention_heads, seqlen, head_dim)
    """
    batch, num_key_value_heads, slen, head_dim = hidden_states.shape
    if n_rep == 1:
        return hidden_states
    hidden_states = hidden_states[:, :, None, :, :].expand(batch, num_key_value_heads, n_rep, slen, head_dim)
    return hidden_states.reshape(batch, num_key_value_heads * n_rep, slen, head_dim)


def eager_attention_forward(
    module: nn.Module,
    query: torch.Tensor,
    key: torch.Tensor,
    value: torch.Tensor,
    attention_mask: torch.Tensor | None,
    scaling: float,
    dropout: float = 0.0,
    **kwargs: Unpack[TransformersKwargs],
):
    key_states = repeat_kv(key, module.num_key_value_groups)
    value_states = repeat_kv(value, module.num_key_value_groups)

    attn_weights = torch.matmul(query, key_states.transpose(2, 3)) * scaling
    if attention_mask is not None:
        attn_weights = attn_weights + attention_mask

    attn_weights = nn.functional.softmax(attn_weights, dim=-1, dtype=torch.float32).to(query.dtype)
    attn_weights = nn.functional.dropout(attn_weights, p=dropout, training=module.training)
    attn_output = torch.matmul(attn_weights, value_states)
    attn_output = attn_output.transpose(1, 2).contiguous()

    return attn_output, attn_weights


@use_kernelized_func(apply_rotary_pos_emb)
class HrmTextAttention(nn.Module):
    """Multi-headed attention from 'Attention Is All You Need' paper"""

    def __init__(self, config: HrmTextConfig, layer_idx: int):
        super().__init__()
        self.config = config
        self.layer_idx = layer_idx
        self.head_dim = getattr(config, "head_dim", config.hidden_size // config.num_attention_heads)
        self.num_key_value_groups = 1  # Uses MHA instead of GQA
        self.scaling = self.head_dim**-0.5
        self.attention_dropout = config.attention_dropout
        self.is_causal = True

        self.q_proj = nn.Linear(
            config.hidden_size, config.num_attention_heads * self.head_dim, bias=config.attention_bias
        )
        self.k_proj = nn.Linear(
            config.hidden_size,
            config.num_attention_heads * self.head_dim,
            bias=config.attention_bias,
        )
        self.v_proj = nn.Linear(
            config.hidden_size,
            config.num_attention_heads * self.head_dim,
            bias=config.attention_bias,
        )
        self.o_proj = nn.Linear(
            config.num_attention_heads * self.head_dim, config.hidden_size, bias=config.attention_bias
        )
        # Additional sigmoid gate applied at the end
        self.gate_proj = nn.Linear(
            config.hidden_size,
            config.num_attention_heads * self.head_dim,
            bias=config.attention_bias,
        )

    def forward(
        self,
        hidden_states: torch.Tensor,
        position_embeddings: tuple[torch.Tensor, torch.Tensor] | None = None,
        attention_mask: torch.Tensor | None = None,
        past_key_values: Cache | None = None,
        cycle_offset: int = 0,
        **kwargs: Unpack[TransformersKwargs],
    ) -> tuple[torch.Tensor, torch.Tensor]:
        input_shape = hidden_states.shape[:-1]
        hidden_shape = (*input_shape, -1, self.head_dim)

        query_states = self.q_proj(hidden_states).view(hidden_shape).transpose(1, 2)
        key_states = self.k_proj(hidden_states).view(hidden_shape).transpose(1, 2)
        value_states = self.v_proj(hidden_states).view(hidden_shape).transpose(1, 2)
        gate_states = self.gate_proj(hidden_states).view(hidden_shape)

        cos, sin = position_embeddings
        query_states, key_states = apply_rotary_pos_emb(query_states, key_states, cos, sin)

        if past_key_values is not None:
            # Adjust cache slot by `cycle_offset` which is determined by it's current recurrent step through the stacks
            key_states, value_states = past_key_values.update(key_states, value_states, self.layer_idx + cycle_offset)

        attention_interface: Callable = ALL_ATTENTION_FUNCTIONS.get_interface(
            self.config._attn_implementation, eager_attention_forward
        )
        attn_output, attn_weights = attention_interface(
            self,
            query_states,
            key_states,
            value_states,
            attention_mask,
            dropout=0.0 if not self.training else self.attention_dropout,
            scaling=self.scaling,
            **kwargs,
        )

        # Additional sigmoid gating (similar to Qwen3Next)
        attn_output = torch.sigmoid(gate_states) * attn_output
        attn_output = attn_output.reshape(*input_shape, -1).contiguous()
        attn_output = self.o_proj(attn_output)
        return attn_output, attn_weights


class HrmTextDecoderLayer(GradientCheckpointingLayer):
    def __init__(self, config: HrmTextConfig, layer_idx: int):
        super().__init__()
        self.hidden_size = config.hidden_size

        self.self_attn = HrmTextAttention(config=config, layer_idx=layer_idx)

        self.mlp = HrmTextMLP(config)
        self.input_layernorm = HrmTextRMSNorm(eps=config.rms_norm_eps)
        self.post_attention_layernorm = HrmTextRMSNorm(eps=config.rms_norm_eps)

    def forward(
        self,
        hidden_states: torch.Tensor,
        attention_mask: torch.Tensor | None = None,
        position_ids: torch.LongTensor | None = None,
        past_key_values: Cache | None = None,
        use_cache: bool | None = False,
        position_embeddings: tuple[torch.Tensor, torch.Tensor] | None = None,
        **kwargs: Unpack[TransformersKwargs],
    ) -> torch.Tensor:
        residual = hidden_states
        hidden_states = self.input_layernorm(hidden_states)
        # Self Attention
        hidden_states, _ = self.self_attn(
            hidden_states=hidden_states,
            attention_mask=attention_mask,
            position_ids=position_ids,
            past_key_values=past_key_values,
            use_cache=use_cache,
            position_embeddings=position_embeddings,
            **kwargs,
        )
        hidden_states = residual + hidden_states

        # Fully Connected
        residual = hidden_states
        hidden_states = self.post_attention_layernorm(hidden_states)
        hidden_states = self.mlp(hidden_states)
        hidden_states = residual + hidden_states
        return hidden_states


class HrmTextStack(nn.Module):
    """A single transformer stack — used twice inside, once as H module and once as L module"""

    def __init__(self, config: HrmTextConfig):
        super().__init__()
        self.layers = nn.ModuleList(
            [HrmTextDecoderLayer(config, layer_idx) for layer_idx in range(config.num_layers_per_stack)]
        )
        self.final_norm = HrmTextRMSNorm(eps=config.rms_norm_eps)

    def forward(
        self,
        hidden_states: torch.Tensor,
        attention_mask: torch.Tensor | None = None,
        past_key_values: Cache | None = None,
        position_embeddings: tuple[torch.Tensor, torch.Tensor] | None = None,
        cycle_offset: int = 0,
        **kwargs: Unpack[TransformersKwargs],
    ) -> torch.Tensor:
        for layer in self.layers:
            hidden_states = layer(
                hidden_states,
                attention_mask=attention_mask,
                past_key_values=past_key_values,
                position_embeddings=position_embeddings,
                cycle_offset=cycle_offset,
                **kwargs,
            )
        return self.final_norm(hidden_states)


@auto_docstring
class HrmTextPreTrainedModel(PreTrainedModel):
    config: HrmTextConfig
    base_model_prefix = "model"
    supports_gradient_checkpointing = True
    _no_split_modules = ["HrmTextDecoderLayer"]
    _skip_keys_device_placement = ["past_key_values"]
    _supports_flash_attn = True
    _supports_sdpa = True
    _supports_flex_attn = True

    _can_compile_fullgraph = True
    _supports_attention_backend = True
    _can_record_outputs = {
        "hidden_states": HrmTextDecoderLayer,
        "attentions": HrmTextAttention,
    }

    def _check_and_adjust_attn_implementation(
        self, attn_implementation: str | None, is_init_check: bool = False, allow_all_kernels: bool = False
    ) -> str:
        if attn_implementation is not None and self.config.prefix_lm:
            _, base_implementation = split_attention_implementation(attn_implementation)
            if is_flash_attention_requested(requested_attention_implementation=base_implementation):
                raise ValueError(
                    f"`attn_implementation={attn_implementation!r}` is not supported when "
                    "`config.prefix_lm=True`: FlashAttention cannot represent the PrefixLM 4-D mask "
                    "overlay. Use `'sdpa'` (default) or `'flex_attention'`, or set `config.prefix_lm=False`."
                )
        return super()._check_and_adjust_attn_implementation(attn_implementation, is_init_check, allow_all_kernels)

    @torch.no_grad()
    def _init_weights(self, module):
        super()._init_weights(module)
        if isinstance(module, HrmTextModel):
            init.zeros_(module.z_L_init)
            # `z_L_init` is the frozen low-cycle initial state and never trains.
            module.z_L_init.requires_grad_(False)  # trf-ignore: TRF012


class HrmTextRotaryEmbedding(nn.Module):
    inv_freq: torch.Tensor  # fix linting for `register_buffer`

    def __init__(self, config: HrmTextConfig, device=None):
        super().__init__()
        self.max_seq_len_cached = config.max_position_embeddings
        self.original_max_seq_len = config.max_position_embeddings

        self.config = config

        self.rope_type = self.config.rope_parameters["rope_type"]
        rope_init_fn: Callable = self.compute_default_rope_parameters
        if self.rope_type != "default":
            rope_init_fn = ROPE_INIT_FUNCTIONS[self.rope_type]
        inv_freq, self.attention_scaling = rope_init_fn(self.config, device)

        self.register_buffer("inv_freq", inv_freq, persistent=False)
        self.register_buffer("original_inv_freq", inv_freq.clone(), persistent=False)

    @staticmethod
    def compute_default_rope_parameters(
        config: HrmTextConfig | None = None,
        device: Optional["torch.device"] = None,
        seq_len: int | None = None,
    ) -> tuple["torch.Tensor", float]:
        """
        Computes the inverse frequencies according to the original RoPE implementation
        Args:
            config ([`~transformers.PreTrainedConfig`]):
                The model configuration.
            device (`torch.device`):
                The device to use for initialization of the inverse frequencies.
            seq_len (`int`, *optional*):
                The current sequence length. Unused for this type of RoPE.
        Returns:
            Tuple of (`torch.Tensor`, `float`), containing the inverse frequencies for the RoPE embeddings and the
            post-processing scaling factor applied to the computed cos/sin (unused in this type of RoPE).
        """
        base = config.rope_parameters["rope_theta"]
        dim = getattr(config, "head_dim", None) or config.hidden_size // config.num_attention_heads

        attention_factor = 1.0  # Unused in this type of RoPE

        # Compute the inverse frequencies
        inv_freq = 1.0 / (
            base ** (torch.arange(0, dim, 2, dtype=torch.int64).to(device=device, dtype=torch.float) / dim)
        )
        return inv_freq, attention_factor

    @torch.no_grad()
    @dynamic_rope_update  # power user: used with advanced RoPE types (e.g. dynamic rope)
    def forward(self, x, position_ids):
        inv_freq_expanded = self.inv_freq[None, :, None].float().expand(position_ids.shape[0], -1, 1).to(x.device)
        position_ids_expanded = position_ids[:, None, :].float()

        device_type = x.device.type if isinstance(x.device.type, str) and x.device.type != "mps" else "cpu"
        with maybe_autocast(device_type=device_type, enabled=False):  # Force float32
            freqs = (inv_freq_expanded.float() @ position_ids_expanded.float()).transpose(1, 2)
            emb = torch.cat((freqs, freqs), dim=-1)
            cos = emb.cos() * self.attention_scaling
            sin = emb.sin() * self.attention_scaling

        return cos.to(dtype=x.dtype), sin.to(dtype=x.dtype)


@auto_docstring
class HrmTextModel(HrmTextPreTrainedModel):
    def __init__(self, config: HrmTextConfig):
        super().__init__(config)
        self.padding_idx = config.pad_token_id
        self.vocab_size = config.vocab_size

        self.embed_tokens = nn.Embedding(config.vocab_size, config.hidden_size, self.padding_idx)
        self.rotary_emb = HrmTextRotaryEmbedding(config=config)
        self.gradient_checkpointing = False

        self.embedding_scale = config.embedding_scale

        # Recursive module structures
        self.L_module = HrmTextStack(config)
        self.H_module = HrmTextStack(config)
        # Initial state for the low cycle module
        self.z_L_init = nn.Parameter(torch.zeros(config.hidden_size), requires_grad=False)

        raw_bp = list(config.L_bp_cycles)
        self.L_bp_cycles_padded = [1] * max(0, config.H_cycles - len(raw_bp)) + raw_bp

        # Initialize weights and apply final processing
        self.post_init()

    @merge_with_config_defaults
    @capture_outputs
    @auto_docstring
    def forward(
        self,
        input_ids: torch.LongTensor | None = None,
        attention_mask: torch.Tensor | None = None,
        position_ids: torch.LongTensor | None = None,
        past_key_values: Cache | None = None,
        token_type_ids: torch.LongTensor | None = None,
        inputs_embeds: torch.FloatTensor | None = None,
        use_cache: bool | None = None,
        **kwargs: Unpack[TransformersKwargs],
    ) -> BaseModelOutputWithPast:
        r"""
        token_type_ids (`torch.LongTensor` of shape `(batch, seq_len)`, *optional*):
            Per-position bidirectional/causal indicator. Tokens with `token_type_ids == 1`
            form a single bidirectional block; all other positions are causal.
        """
        if (input_ids is None) ^ (inputs_embeds is not None):
            raise ValueError("You must specify exactly one of input_ids or inputs_embeds")

        if inputs_embeds is None:
            inputs_embeds = self.embed_tokens(input_ids)
        # Additional scaling on the input embeds
        inputs_embeds = inputs_embeds * self.embedding_scale

        if use_cache and past_key_values is None:
            past_key_values = DynamicCache(config=self.config)

        if position_ids is None:
            past_seen_tokens = past_key_values.get_seq_length() if past_key_values is not None else 0
            position_ids = torch.arange(inputs_embeds.shape[1], device=inputs_embeds.device) + past_seen_tokens
            position_ids = position_ids.unsqueeze(0)

        # Create mask with optional prefix-based bidirectionality
        mask_kwargs = {
            "config": self.config,
            "inputs_embeds": inputs_embeds,
            "attention_mask": attention_mask,
            "past_key_values": past_key_values,
            "position_ids": position_ids,
        }
        is_first_iteration = past_key_values is None or not past_key_values.is_initialized
        if token_type_ids is not None and is_first_iteration:
            if self.config.prefix_lm:
                mask_kwargs["block_sequence_ids"] = torch.where(token_type_ids == 1, 0, -1)
            else:
                logger.warning_once("`token_type_ids` was provided but `config.prefix_lm=False`; ignoring it.")

        attention_mask = create_causal_mask(**mask_kwargs)
        position_embeddings = self.rotary_emb(inputs_embeds, position_ids)

        # Hierarchical (H/L)-cycle recurrence
        #
        # `z_H` - slow / high-level state
        hidden_states_high_cycle = inputs_embeds
        # `z_L` - fast / low-level state
        hidden_states_low_cycle = (
            self.z_L_init.to(dtype=hidden_states_high_cycle.dtype, device=hidden_states_high_cycle.device)
            .expand_as(hidden_states_high_cycle)
            .contiguous()
        )

        # Cache-slot layout under the recurrent forward:
        #
        #   slot(h, l, layer)   = (h * (L_cycles + 1) + l) * num_layers_per_stack + layer
        #                                                       ^— L-stack invocation at (h, l)
        #   slot(h, H, layer)   = (h * (L_cycles + 1) + L_cycles) * num_layers_per_stack + layer
        #                                                       ^— trailing H-stack invocation
        #
        # That totals `num_layers_per_stack * H_cycles * (L_cycles + 1)` slots, i.e. the `config.num_hidden_layers`.
        num_layers_per_stack = self.config.num_layers_per_stack
        for high_cycle_idx in range(self.config.H_cycles):
            # `L_bp_cycles` k-step grad trick: only the trailing `num_grad_iterations` of the
            # `L_cycles` inner iterations propagate gradients; earlier iterations run under
            # `torch.no_grad()` to bound activation memory.
            num_grad_iterations = (
                self.L_bp_cycles_padded[high_cycle_idx] if high_cycle_idx < len(self.L_bp_cycles_padded) else 1
            )
            grad_threshold = self.config.L_cycles - num_grad_iterations
            for low_cycle_idx in range(self.config.L_cycles):
                cycle_offset = (high_cycle_idx * (self.config.L_cycles + 1) + low_cycle_idx) * num_layers_per_stack
                ctx = nullcontext() if low_cycle_idx >= grad_threshold else torch.no_grad()
                with ctx:
                    hidden_states_low_cycle = self.L_module(
                        hidden_states_low_cycle.to(hidden_states_high_cycle.device) + hidden_states_high_cycle,
                        attention_mask=attention_mask,
                        past_key_values=past_key_values,
                        position_embeddings=position_embeddings,
                        position_ids=position_ids,
                        cycle_offset=cycle_offset,
                        **kwargs,
                    )

            cycle_offset = (high_cycle_idx * (self.config.L_cycles + 1) + self.config.L_cycles) * num_layers_per_stack

            hidden_states_high_cycle = self.H_module(
                hidden_states_high_cycle + hidden_states_low_cycle.to(hidden_states_high_cycle.device),
                attention_mask=attention_mask,
                past_key_values=past_key_values,
                position_embeddings=position_embeddings,
                position_ids=position_ids,
                cycle_offset=cycle_offset,
                **kwargs,
            )

        return BaseModelOutputWithPast(
            last_hidden_state=hidden_states_high_cycle,
            past_key_values=past_key_values,
        )


@auto_docstring
class HrmTextForCausalLM(HrmTextPreTrainedModel, GenerationMixin):
    _tied_weights_keys = {"lm_head.weight": "model.embed_tokens.weight"}
    _tp_plan = {"lm_head": "colwise_gather_output"}
    _pp_plan = {"lm_head": (["hidden_states"], ["logits"])}

    def __init__(self, config):
        super().__init__(config)
        self.model = HrmTextModel(config)
        self.vocab_size = config.vocab_size
        self.lm_head = nn.Linear(config.hidden_size, config.vocab_size, bias=False)

        # Initialize weights and apply final processing
        self.post_init()

    @can_return_tuple
    @auto_docstring
    def forward(
        self,
        input_ids: torch.LongTensor | None = None,
        attention_mask: torch.Tensor | None = None,
        position_ids: torch.LongTensor | None = None,
        past_key_values: Cache | None = None,
        token_type_ids: torch.LongTensor | None = None,
        inputs_embeds: torch.FloatTensor | None = None,
        labels: torch.LongTensor | None = None,
        use_cache: bool | None = None,
        logits_to_keep: int | torch.Tensor = 0,
        **kwargs: Unpack[TransformersKwargs],
    ) -> CausalLMOutputWithPast:
        r"""
        token_type_ids (`torch.LongTensor` of shape `(batch, seq_len)`, *optional*):
            Per-position bidirectional/causal indicator. Tokens with `token_type_ids == 1`
            form a single bidirectional block; all other positions are causal.
        """
        outputs: BaseModelOutputWithPast = self.model(
            input_ids=input_ids,
            attention_mask=attention_mask,
            position_ids=position_ids,
            past_key_values=past_key_values,
            token_type_ids=token_type_ids,
            inputs_embeds=inputs_embeds,
            use_cache=use_cache,
            **kwargs,
        )

        hidden_states = outputs.last_hidden_state
        slice_indices = slice(-logits_to_keep, None) if isinstance(logits_to_keep, int) else logits_to_keep
        logits = self.lm_head(hidden_states[:, slice_indices, :])

        loss = None
        if labels is not None:
            loss = self.loss_function(logits=logits, labels=labels, vocab_size=self.config.vocab_size, **kwargs)

        return CausalLMOutputWithPast(
            loss=loss,
            logits=logits,
            past_key_values=outputs.past_key_values,
            hidden_states=outputs.hidden_states,
            attentions=outputs.attentions,
        )

    @staticmethod
    def create_masks_for_generate(
        config: PreTrainedConfig,
        inputs_embeds: torch.Tensor,
        attention_mask: torch.Tensor | None,
        past_key_values: Cache | None,
        position_ids: torch.Tensor | None,
        token_type_ids: torch.Tensor | None = None,
        is_first_iteration: bool | None = False,
        **kwargs,
    ) -> dict:
        mask_kwargs = {
            "config": config,
            "inputs_embeds": inputs_embeds,
            "attention_mask": attention_mask,
            "past_key_values": past_key_values,
            "position_ids": position_ids,
        }
        if token_type_ids is not None and is_first_iteration:
            if config.prefix_lm:
                mask_kwargs["block_sequence_ids"] = torch.where(token_type_ids == 1, 0, -1)
            else:
                logger.warning_once("`token_type_ids` was provided but `config.prefix_lm=False`; ignoring it.")

        return create_masks_for_generate(**mask_kwargs)


__all__ = ["HrmTextForCausalLM", "HrmTextModel", "HrmTextPreTrainedModel"]
